I have bought a used Model 600 indexer with the intention of using it on my oldest hurco, an MD3 with Max 2 control.

The indexer is bare, no solenoid valve or relays or such. Switches (indexer locked, cylinder reverse) are there and wired but not wired for the hurco.

I have the basic pinout for the indexer port on the MD3, but there is no sequence of operation or connection details to help me make up the interface.

On the machine there are 5 wires on the indexer port, two go to TB7-3 and TB7-4 respectively on the relay board, two go to TB6-3 and TB6-16 on the relay board and are labelled "115 VAC" and "115 VAC RETURN" on the schematic. Last is a ground.

If anyone is familiar with this setup, can you give me some pointers?

Thanks, Gregor